Answer
The total volume of water in the cloud is between $2\times10^3m^3$ to $2\times10^4m^3$
Work Step by Step
First we calculate the volume of the cloud:
$V=3000m\timesπ\times(1000m)^2=9.4\times10^9m^3$
If one $cm^2$ has 50 to 500 drops of water, then one $m^2$ would have $5\times10^7$ to $5\times10^8$ drops.
We then multiply that range by our volume answer to get that the whole cloud can have between $4.7\times10^{18}$ to $4.7\times10^{19}$ drops.
Then we calculate the volume of a drop:
$V=\frac{4}{3}π(10^{-5}m)^3=4.2\times10^{-15}m^3$
And then by multiplying this volume by our total range of drops in the cloud to get the total volume range in the cloud.
$2\times10^3m^3$ to $2\times10^4m^3$
